Dissertation / PhD Thesis/Book

PreJuSER-35029

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Über lineare und nichtlineare Transformationen neuroelektromagnetischer Signale : Theorie und Anwendung am Beispiel einer Sprachstudie

Groß, J. (Corresponding author)FZJ*

2004
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/3649

Report No.: Juel-3673

Abstract: Magnetoencephalography (IvlEG) is an important technique for the investigation of cognitive processes like language processing since it offers a very high temporal resolution and the measured signals are rather independent of differences of conductivity within the human head, Modern whole-head systems allow the simultaneous measurement of the magnetic flux at more than hundred locations outside the head. The interpretation of the data is complicated due to the complex structure of the sensitivity profile (leadficld) of a single sensor. After an introduction to the basic concepts of magnetoencephalography the structure of data space is investigated and described based on the leadfields for a specific case. Figures of merit are introduced which allow a characterization of the relevant properties of the MEG system. The complex structure of data space can be modified with linear transformations in order to enhance desired properties of the data. Different methods are compared within the common framework of optimization of functionals. This framework necessitates the mathematical formulation of the desired properties. Another part describes the results from a language study. In this study the MEG correlates of syntactic processing were investigated by means of linear and nonlinear analysis methods. A characteristic component was evident in the data that has been linked to the fast processing of syntactic information. This finding is consistent with previous EEG studies. Generators of this component were localized in the vicinity of the auditory cortex and in inferior regions of the frontal lobe. The results from data measured with different ]VIEG systems were consistent

Note: Record converted from JUWEL: 18.07.2013; Record converted from VDB: 12.11.2012
Note: Düsseldorf, Univ., Diss., 1999

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Contributing Institute(s):

1. Institut für Medizin (IME)

Research Program(s):

1. ohne FE (ohne FE)

Appears in the scientific report 1999

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Database coverage:

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